Starting from rest, a 1.9x10-4 kg flea springs straightupward. while the flea is pushing off from the ground, the groundexerts an average upward force of 0.41 n on it. this force does1.8x10-4 j of work on the flea. (a)what is the flea's speed when it leaves the ground? (b) how far upward does the flea move while it ispushing off? ignore both air resistance and the flea's weight.

Consider a file currently consisting of 200 blocks. assume that the file control block (and the index block in the case of indexed allocation) is already in memory. calculate how many disk i/o operations are required for contiguous, linked, and indexed (single-level) allocation strategies, for each of the conditions listed below. in the contiguous-allocation case, assume that there is not room to grow at the beginning but there is room to grow at the end. also assume that the block information to be added is stored in memory.